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2.
A cupcake party is similar to going, egging, where a couple of people get in a car, and throw cupcakes at pedestrians. if it all goes well the frosting on top of the cupcake will stick to the victim.
colored frosting add to the fun, as they will stain the victim with a nice big colored spot.

originating in Bamberg, Germany
"cupcake party dude?" "uhm ya ... im in. your car or mine?"
by Kennman November 12, 2013
 
1.
1. A party hosted by many women where only one man is invited (often times a hired stripper), with the sole purpose of ganging up on him and humiliating him sexually, generally without his knowledge or consent.
Chris attended his neighborhood cupcake party, and his fragile ego was systematically warped after hours of freaky dehumanizing sex.
by Jen April 25, 2005
 
3.
One of the most filthy, disgusting videos out there. Two Girls nor Jar Squatter does not hold a candle to this, if you can find it. The video involves four guys, three girls, a glass table top and one cupcake.
Dude, clean up your cupcake party. It’s all over my grandmothers couch.
by bosshaug29 April 04, 2011
 
4.
Having a cupcake party or bringing cupcakes is code for bringing ammunition and guns to a designated location with the intent of embarking on a massive shooting rampage with all those who are present.
David is bringing in cupcakes for his cupcake party at work today!

Oh shit! he brought cupcakes run!
by Marcus Marvalo Larson February 26, 2009